(Lianja) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loHttp = createobject("CkHttp")

// We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
loSslCert = loHttp.GetServerSslCert("nationalgeographic.com",443)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    return
endif

// Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
// be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
// will be returned.  The certificate chain's ReachesRoot property can be examined to 
// see if the chain was completed to the root.
loCertChain = loSslCert.GetCertChain()
if (loSslCert.LastMethodSuccess = .F.) then
    ? loSslCert.LastErrorText
    release loSslCert
    release loHttp
    return
endif

i = 0
lnNumCerts = loCertChain.NumCerts
do while i < lnNumCerts
    loCert = loCertChain.GetCert(i)
    ? "SubjectDN " + str(i) + ": " + loCert.SubjectDN
    ? "IssuerDN " + str(i) + ": " + loCert.IssuerDN
    release loCert
    i = i + 1
enddo

// If the certificate chain reaches the root CA cert, then the last cert in the chain
// is the root CA cert.
if (loCertChain.ReachesRoot = .T.) then
    loCaCert = loCertChain.GetCert(lnNumCerts - 1)
    ? "CA Root Cert: " + loCaCert.SubjectDN
    release loCaCert
endif

release loSslCert
release loCertChain


release loHttp